Improved machine for removing scale from steam-boiler flues



N. PETERS, FMTDMTMOGRAPHER WASHINGTON, D C.

UNITED STATES NPATENT OFFICE.

lMPROVED MACHINE FOR REMOVING SCALE FROM STlAM-BOILl-lil FLUES.

Specification forming part of Letters Patent No. 49,255, dated August 8, 1865 antedated March 30, 1865.

To all whom 'it may concern:

Be it known that I, P. ELnnEnefE'Grkavnv,V of Philadelphia, in the county of Philadelphia, in the State of Pennsylvania, have invented a new and Improved Machine for Scaling the rIubes of Steam-Boilers; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

My invention relates to removing the scale deposited on the inside of the tubes of steamboilers by means of a cutter revolving on a screw, which screw passes the entire length of the tube and is secured at its 'bottom by such suitable device as is hereinafter described.

In order to enable skilled mechanics to make and use my invention, I will proceed to describe its construction and operation.

On reference to the accompanying drawings, which form a part of this specification, Figure 1 is a sectional view. Fig. il is a bottom view of the cutter. Fig. 3 is a view of the baseplate, showing the groove and conical projection. Fig. 4 is a view ofthe base-plate, showingthe dog H.

Similar letters refer to similar parts throughout the several views.

A A representthe top and bottom lube-sheets of a steam-boiler- B is a tube with an inside coating of scale,U.

D is a feed-screw, which passes the whole length of the tube B, and has the cutter E screwed ontoits upper end, and is kept in place at the lower end of the tube B by the baseplate F, the dog H, and the thumb srrew K. The cutter E is screwed on the socket N, which socket has the shank b screwed onto its upper end. A hole for the reception of the screw D is drilled the whole length o1"A the cutter, socket, and shank. A screw is cut in the cutter E for screwing the cutter onto the screw D. The shank b is made of any convenient shape for working with a ratch-wreuch or any similar device. When the scale is cut out about onehalf the length of the tube another socket is attached to the shank b, of sncieut length to carry the cutter to the bottom of the tube.

The base-plate F has the conical-shaped collar c projecting from its innerface. This collar c enters and expands the tnbeB and keeps .it water-tight while the tube is being scaled.

The groove d is cut in the inner face of the base-plate F, and is for receiving the lap c ot' the tube B. The circular hole L in the baseplate is made sufficiently large to allow the scale-cuttings to drop out between the screw D and the edge ot' the hole L. The shoulderf of the screw-spindle bears against the inner side ofthe boss g ofthe dog H, andwhen the thumb-screw K is tirmly screwed down a firm and secure connection is made between the screw D and the dog H. The opening l1l in the boss gis made square, and the end t oll the screw-spindle is made to suit to keep the screw D from turning.

In proceeding to use my tube-sealer I rst screw the cutter E onto the screw D, then passing the screw D down the-tube B until the edges ofthe cutter E bear against the scale G.

`I then 'arrange the base-plate F, the dog H,

and the thumb-screw, K as shown in.Fig. 1.

The cutter E is worked b v a ratchet-wrench or its equivalent applied at the shank b, which ratchet-wrench gives it a circular-cutting motion, while the screw D imparts the necessary feed motion by keeping the cutter E screwed the purpose and in the manner as herein described.

- P. ELDREDGE GARVIN.

Witnesses:

. AMos J. KELLY,

J AMES MCOALEM. 

